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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power offers quotations, manuals, selection, and model matching for 6ES5947-3UA22.

        6ES5947-3UA22

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        1001 reviews ｜ Need a Specific Revision?
        Siemens 6ES5947-3UA22 is a CPU 947 central processor for the SIMATIC S5-155U controller, executing STEP 5 programs with integrated RAM, real-time clock, and interrupt handling.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Technical specifications for 6ES5947-3UA22

        • Manufacturer:
          Siemens
        • Part Number:
          6ES5947-3UA22
        • Product Family:
          Siemens Simatic S5
        • Product Type:
          SIMATIC S5-155U CPU 947 Processor
        • Stock:
          1
        • Programming Language:
          STEP 5
        • Integrated User Memory:
          64 Kwords RAM
        • Memory Monitoring:
          Parity monitoring
        • Maximum Memory with 355 Module:
          896 Kbytes
        • Arithmetic Support:
          Floating-point operations
        • Program Processing:
          Cyclic, time-driven, and interrupt-driven
        • Time Bases:
          9
        • Interrupt Points:
          8 block-boundary or 4 hardware interrupts
        • Real-Time Clock:
          Integrated
        • Multiprocessor Operation:
          Supported
        • Rear Bus Connections:
          2 x 64-pin connectors
        • Front Interface:
          15-pin programming/operator/SINEC connection
        • Protection Rating:
          IP00
        • Operating Temperature:
          0 to 55 °C
        • Storage and Transport Temperature:
          -40 to 70 °C
        • Relative Humidity:
          Up to 95% at 25 °C, non-condensing
        • Maximum Operating Altitude:
          3,500 m
        • Weight:
          1.356 lbs (0.615 kg)
        • Tariff Code:
          85389091
        • Country of origin:
          Germany
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals CPU Memory Interfaces Operation

        Features:

        • The CPU 947 executes STEP 5 programs inside the S5-155U central controller.
        • Integrated parity-monitored RAM and optional 355 memory expansion organize the user program.
        • Cyclic, timed, interrupt, and multiprocessor functions coordinate program execution and communication.
        Siemens 6ES5947-3UA22 converts the STEP 5 program and process image into controller actions on the S5 local bus.

        Memory and timing resources in 6ES5947-3UA22 support both ordinary scan execution and scheduled or event-driven blocks.

        The front service interface of 6ES5947-3UA22 provides a separate path for programming, operator access, or SINEC communication.

        The Siemens 6ES5947-3UA22 is the CPU 947 production version documented as functionally identical to the preceding -3UA21 version.
        Siemens 6ES5947-3UA22 SIMATIC S5-155U CPU 947 Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

        STEP 5 Execution Levels

        • Cyclic scan: The processor repeatedly executes the configured cyclic program.
        • Timed tasks: Nine time bases trigger scheduled program levels.
        • Interrupt tasks: Block-boundary and hardware interrupts start configured event routines.
        • Arithmetic: Floating-point operations execute inside the CPU 947 instruction set.

        Program and Data Storage

        • Integrated RAM: The processor provides 64 Kwords with parity monitoring.
        • Expansion: A 355 memory module extends the documented capacity to 896 Kbytes.
        • Retention: Program retention depends on the documented controller memory and backup arrangement.
        • Clock: The integrated real-time clock supplies time information to the program.

        Backplane and Service Connections

        • Local bus: Two 64-pin rear connectors couple the processor to the S5 bus.
        • Front port: The 15-pin connection serves programming, operator, or SINEC equipment.
        • Shared resources: Multiprocessor operation coordinates common peripherals on the system bus.
        • Cabinet role: IP00 construction requires installation inside the S5 controller enclosure.

        Startup and Multiprocessor Behavior

        • Restart selection: The documented restart type controls how retained data and program execution resume.
        • Smooth STOP: Specific communication functions can continue in the defined smooth STOP mode.
        • CPU pairing: A second CPU 946/947 or documented S5-135U CPU can share the controller.
        • Diagnostics: Programmer status functions expose the current operating and startup condition.
        Description
        Siemens 6ES5947-3UA22 is the CPU 947 central processor for a SIMATIC S5-155U programmable controller. It executes the STEP 5 user program, maintains the controller memory map, and coordinates communication with the local S5 bus and the front programming interface.

        An integrated 64 Kword RAM with parity monitoring stores the working program of 6ES5947-3UA22. When the documented 355 memory module is installed, the available memory can be extended to 896 Kbytes, while the real-time clock supplies time references for scheduled processing.

        Program execution in 6ES5947-3UA22 can be cyclic, time-driven through nine time bases, or interrupt-driven at block boundaries and hardware inputs. Floating-point arithmetic and the documented STEP 5 operations run within these processing levels rather than through a separate coprocessor.

        Two 64-pin rear connectors couple 6ES5947-3UA22 to the S5 local bus, while the front 15-pin interface connects a programmer, operator panel, or SINEC path. Multiprocessor operation permits another CPU 946/947 or a compatible S5-135U CPU to share system resources under the documented configuration.
        Alternative Names
        6ES59473UA22 6ES5947 3UA22 6ES5 947 3UA22 Siemens 6ES5947-3UA22 6ES5947-3UA22 CPU 947 6ES5947-3UA2Z 6ES5947-3UA2I Siemens CPU 947 6ES5 947 3UA22
        Technical notes
        The production update identified as Siemens 6ES5947-3UA22 retains the documented CPU 947 functional scope while using the updated full order number.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Why can 6ES5947-3UA22 enter STOP immediately after memory work?
        For 6ES5947-3UA22, check memory-module seating, parity status, backup supply, selected restart type, program consistency, and the diagnostic information shown by the programmer.
        What should be recorded before replacing 6ES5947-3UA22?
        Record the 6ES5947-3UA22 STEP 5 program, memory-module contents, interface settings, restart parameters, interrupt configuration, and any multiprocessor assignments.
        Why can a programmer fail to communicate with 6ES5947-3UA22 although the CPU is powered?
        Check the 6ES5947-3UA22 front 15-pin cable, interface mode, programmer settings, rack power, CPU operating state, and whether another connected device occupies the service path.
        How does memory expansion change the usable capacity of 6ES5947-3UA22?
        The 6ES5947-3UA22 starts with 64 Kwords of integrated RAM; the documented 355 memory module can extend the total program storage to 896 Kbytes.
        Why can a timed routine on 6ES5947-3UA22 run at the wrong interval?
        Compare the 6ES5947-3UA22 selected time base, time parameter, block assignment, scan load, interrupt priority, and real-time clock settings.
        What must match when 6ES5947-3UA22 participates in a multiprocessor system?
        The 6ES5947-3UA22 CPU roles, shared peripheral assignment, interprocessor communication blocks, memory areas, and restart parameters must agree across the configured processors.

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